Residential Spring Failure Safety Device – Left Hand Wound, 2" Spring Fitting

The Residential Spring Failure Device – Left Hand Wound is a safety component designed to help prevent a residential sectional garage door from falling if a torsion spring breaks.

Installed as part of the torsion spring and shaft assembly, the device responds to spring failure by locking the shaft and helping prevent uncontrolled downward movement of the door.

This listing is specifically for the Left Hand Wound version and is designed for compatible residential torsion spring systems using 2" spring fittings and a tube shaft.

Product Features

• Residential garage door spring failure safety device

• Left Hand Wound configuration

• Helps prevent uncontrolled door movement if a torsion spring breaks

• Compatible with 2" spring fittings

• Designed for use with a tube shaft

• 3-3/8" shaft offset

• One device required for each torsion spring

• One-time-use safety device

• Locking wheel included

• Designed for residential sectional garage doors

• Professional installation recommended

Specifications

• Product Type: Residential Spring Failure Device

• Winding Direction: Left Hand Wound

• Compatible Spring Fitting: 2"

• Shaft Type: Tube Shaft

• Shaft Offset: 3-3/8"

• Quantity Required: 1 Device per Spring

• Maximum Door Weight – Single Spring: 150 lb

• Maximum Door Weight – Two Springs: 470 lb

• Device Type: One-Time Use

Locking Wheel Hardware

The locking wheel includes:

• 2 Set Screws

• 1 Self-Drilling Screw

These components are used as part of the proper installation and securing of the spring failure device to the shaft assembly.

How It Works

A torsion spring stores a significant amount of energy while helping counterbalance the weight of the garage door.

If the spring breaks, the counterbalance system can suddenly lose its ability to support the door.

The spring failure device is designed to react to that failure and lock the shaft, helping prevent the door from dropping uncontrollably.

One Device Per Spring

One spring failure device is required for each torsion spring.

For a two-spring residential door, two correctly oriented devices are required — one for each spring.

This listing contains the Left Hand Wound device only. A corresponding Right Hand Wound model is sold separately.

Door Weight Limits

The residential device is rated for:

• Single-spring door: Maximum 150 lb

• Two-spring door: Maximum 470 lb

Do not exceed the manufacturer's specified door-weight limits.

Compatibility

Before ordering, verify:

• Spring winding direction

• 2" spring fitting size

• Tube-shaft configuration

• 3-3/8" shaft offset

• Number of springs

• Total door weight

This listing is for the Left Hand Wound model.

Do not select the device solely based on which side of the garage door the spring is located. Confirm the actual spring winding direction before ordering.

One-Time-Use Safety Device

This is a one-time-use safety component.

If the device activates because of a spring failure, it must be replaced rather than reset and reused.

The failed torsion spring and the complete counterbalance system should also be inspected before the door is returned to service.

Package Contents

• 1 Residential Left Hand Wound Spring Failure Device

• Locking wheel

• 2 set screws

• 1 self-drilling screw

Torsion spring, shaft, right-hand wound device, drums, cables, bearings, and other garage door components are sold separately.

Important Safety Information

Garage door torsion springs and counterbalance systems are under extreme tension and can cause serious injury if serviced incorrectly.

Installation and replacement of a spring failure device should be performed by a trained garage door technician. Always disconnect the operator and properly secure the door before servicing the counterbalance system.